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A177629
Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up, up, up, up.
0
1, 1, 20, 1680, 369600, 167714730, 136194434423, 179979692293317, 361532596882040400
OFFSET
0,3
CROSSREFS
Cf. A014606.
Sequence in context: A177605 A177606 A177617 * A177630 A177294 A177615
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 10 2010
STATUS
approved